Webster's English Dictionary

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chalaza

cha.la.za \k*-'la--z*\ \-.ze-\ \-z*l\ n or cha.la.zae or chalazas [NL, fr. 
   Gk, hailstone; akin to Per zha-la hail] pl  1: either of a pair of spiral 
   bands in the white of a bird's egg that exten d from the yolk and attach to 
   opposite ends of the lining membrane 2: the point at the base of a plant 
   ovule where the seed stalk is attached  - cha.la.zal aj